A powerful blizzard swept through Colorado on Saturday, dumping at least 2 feet of snow in some parts of the state and forcing the cancellation of most of the scheduled flights at the Denver airport, officials said.

United Airlines canceled all of its flights to and from Denver International Airport, the airport said in a statement.

All told, more than 800 flights were grounded Saturday, or more than 65 percent of all scheduled take-offs and landings at the airport, the FlightAware airline tracking website showed. Dozens of other flights were delayed.

Denver International is the fourth-largest hub for United Airlines and Southwest Airlines, and the primary hub for Frontier Airlines, according to its website.

A representative for the airport did not immediately return a call or email seeking comment.

The heavy snow began falling on Friday night and was expected to continue through Sunday, the National Weather Service said.

By noon, local time, Saturday, nearly 5 inches had fallen in Denver, while the storm dumped up to 2 feet in the mountains and foothills, said National Weather Service meteorologist Jim Kalina.

The utility Xcel Energy Colorado reported on its Facebook page that about 8,000 of its customers in the state lost power in the storm and that it had sent out extra crews to deal with problems.